yeah, I was looking stuff up on different wikis to check my facts. there's alot of stuff i never even herd about for vibranium and adamantium, apparently something created vibranium cancer for a while which is unrelated the radioactive properties of the variety found in wakanda.

Well, Capts shield reflects attacks pretty well, and neither one would was indestructible, especially against the Hulk. And as seen in Avengers, Capt does reflect Ironmans flames and Lokies blue...glowstick of destiny. AND, he does manage to ricochet it off Thor and Ironman.

Adamantium is an attempt to reconstruct the steel alloy that happened with the original Captain America shield. It is close to indestructable, and can pretty much cut anything but that original shield. Nobody kept track of how the vibranium and steel got alloyed the first time, so for the most part Adamantium is a "close second" at best.

Vibranium is an exotic, alien metal. It may or may not even be on the mainstream, earthly Periodic Table of Elements. For the most part it only exists on Earth (in the Marvel Universe), in Wakanda, and is known primarily for its energy-absorbing capabilities. The stuff is impervious to heat, corrosion, electricity and magnetism to extremes, but on a physical level it's a relatively soft metal. Closer to aluminum than steel on a purely physical level.

So basically you'll hear of vibranium alloys more than the pure metal itself, at least outside of Wakanda.